Comment by thih9
2 years ago
> Stereo 3D accounts for a left eye and right eye to create depth.
There is a tiny-but-visible difference in composition between "left" and "right" scenes. And now I wonder: what is used for the 2d version?
Is there a "center" version that gets used for 2d? And the 3d version is based on that but offset to the left and right? Or is the 2d version either a "left" or a "right" version? Or something else?
For most studios, the film is visualized and composed normally, then the "flat" version is used as the left eye of the stereo version. An additional set of render passes is made for the right eye using an offset camera (sometimes, if you're creative with compositing you may not need to do an actual render). This process also allows a stereo version to be created relatively cheaply if the client decides they want to do one halfway through production...
Source: Worked on several stereo animated and live action features and designed stereo compositing versioning process.
It seems from what it says further down, the 2d version is the left eye.
See https://disneyanimation.com/process/?drawer=/process/stereo/